Sketcho oil crayons can be blended with your fingertips or layered to give the effect of oil paint. Sketchos are recommended for drawings and outdoor sketching. Versatile oil crayons can be used in a variety of ways - blend them, pile crayon on crayon, do sgraffito, or work with a paint solvent. Available in assorted colors or white. Each Sketcho is 2-1/2” x 1/2”. AP certified non-toxic.